A new topological crystalline insulator material, SnSe in the rock-salt structure, is obtained using molecular beam epitaxy. The thermodynamically unstable rock-salt SnSe phase is stabilized in epitaxial films up to 20 nm by a Bi2Se3 substrate. Dirac surface states are observed at both the and the points using angle-resolved photoemission spectroscopy; this confirms the topological crystalline insulator phase of the films.
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Wang et al. (2015) studied this question.
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